A port replicator is normally used with a laptop computer and is also known as a docking station. The replicator will have a number of ports, similar to those found on your laptop. You simply slide the laptop into the docking unit (replicator) and then you can attach all of the necessary cables to the dock. This saves you time when you find yourself taking your laptop in and out of your office. You no longer have to attach cables each time you return as they will already be attached to the dock.